What to plant in June in the US: sowing and transplanting by USDA zone

In the United States, June planting is entirely determined by your USDA hardiness zone and local frost dates. While northern zones 3 and 4 are safely transplanting tender summer crops after their late spring frost, southern zones 9 and 10 are transitioning to extreme heat-tolerant varieties or starting fall seeds indoors. By organizing your planting schedule around regional climate bands, you can ensure successful summer establishment and prepare for the autumn harvest.

Zones 3 and 4: northern tier and mountain regions

June represents the true start of the warm-season growing window for gardeners in northern states and high-altitude areas. With average last frost dates often extending into late May or early June, soil temperatures finally reach the levels required for sensitive crops. Gardeners can check local frost timelines using the agripure frost dates tool to coordinate exact planting days.

1. Warm-season transplants

• Tomatoes, peppers, and eggplants: Transplant these heat-loving crops into the garden during early June once night temperatures consistently remain above 50°F (10°C). Apply a thick layer of organic mulch around the base of the plants to retain soil warmth and moisture.
• Hardening off: Ensure all indoor-started seedlings undergo a seven to ten day hardening-off process to prevent windburn and sunscald.

2. Direct-sown tender crops

• Squash, pumpkins, and melons: Sow seeds directly into the garden beds in mid-June. These crops prefer soil temperatures of at least 60°F (16°C) for optimal germination. Sowing in raised mounds can help the soil warm up faster and improve drainage.
• Bush beans and sweet corn: Direct-sow these crops in blocks rather than single rows to ensure proper wind pollination for corn and sturdy growth for beans.

3. Cool-season successions

• Leafy greens and radishes: Continue sowing quick-maturing crops like radishes, spinach, and leaf lettuce. Place these plantings in the partial shade of taller crops, such as tomatoes or trellised peas, to prevent premature bolting as summer temperatures rise.

Zones 5 and 6: Midwest, Northeast, and Mid-Atlantic

In zones 5 and 6, the spring frost window is well in the past, and the focus shifts to maximizing summer yields. June is the ideal month for succession planting to avoid harvest gaps in late summer.

1. Bush beans and sweet corn

• Continuous sowing: Plant new batches of bush beans and sweet corn every two weeks throughout June. This practice ensures a steady supply of fresh produce in August and September rather than a single, overwhelming harvest.
• Soil preparation: Before planting successions, replenish the soil with a shallow layer of compost to replace nutrients used by early spring crops.

2. Summer squash and cucumbers

• Pest avoidance: Planting a second wave of summer squash and cucumbers in late June can help salvage yields if early plantings are damaged by cucumber beetles or squash vine borers.
• Spacing and airflow: Space plants according to seed packet instructions to maintain excellent air circulation, which reduces the risk of powdery mildew during humid summer nights.

3. Warm-season herbs

• Basil, dill, and cilantro: Direct-sow these herbs in sunny locations. Basil thrives in the warm soil of June, while dill and cilantro should be sown in successive blocks every two weeks since they mature and go to seed rapidly.

Zones 7 and 8: Upper South and Pacific Northwest

Summer heat arrives in earnest during June for these regions. While the Pacific Northwest experiences dry, mild summers, the Upper South faces high humidity and intense heat. Gardeners must balance maintaining current summer crops with starting the fall garden.

1. Heat-tolerant summer crops

• Okra and southern peas: Sow these crops directly into the garden. They thrive in high temperatures and are highly drought-tolerant once established.
• Sweet potatoes: Plant sweet potato slips in early June. They require a long, hot growing season to develop large tubers and will grow rapidly in the warm June soil. Review options for heat-tolerant crops for hot summers to maximize warm-season production.

2. Midsummer fall crop starts

• Fall brassicas: Start seeds of cabbage, broccoli, cauliflower, and kale indoors or in a shady, protected area in late June. This early start is necessary to have sturdy transplants ready for the garden in late summer. You can read more about this timing in our guide on midsummer sowing for fall brassicas and carrots.
• Root crops: Sow carrots and beets under shade cloth to keep the soil cool and moist during germination.

3. Succession warm-season crops

• Bush beans and summer squash: Plant a final summer crop of bush beans and zucchini in late June. These fast-growing plants will produce a heavy harvest before the first autumn frost. To plan these late-season plantings accurately, refer to our guide on counting backward from frost.

Zones 9 and 10: Gulf Coast, Southwest, Florida, and California

June brings extreme heat to southern zones, making traditional vegetable gardening difficult. In these regions, June is a transitional period where the focus shifts to heat-tolerant survival crops or preparing soil for the fall.

1. Extreme heat-resilient crops

• Malabar spinach and Egyptian spinach: These greens thrive in temperatures above 90°F (32°C) where traditional lettuces immediately bolt and die.
• Okra and eggplants: These crops continue to set fruit despite intense heat and sun. Ensure they receive deep watering at least twice a week.

2. Cover crops for soil protection

• Cowpeas and sunn hemp: If you choose not to grow vegetables during the peak of summer, sow warm-season cover crops. They protect the soil from erosion, suppress weeds, and add nitrogen when tilled under in late summer.
• Mulching bare soil: Never leave garden soil bare under the intense summer sun. Apply a thick layer of straw, wood chips, or leaves to prevent soil sterilization and water loss.

3. Fall seed starting indoors

• Tomatoes and peppers: Start seeds indoors in late June for the fall garden. Because summer heat prevents fruit set in these crops, starting them now allows you to transplant them into the garden in August for a productive autumn harvest.

Essential June gardening jobs across the United States

Regardless of your hardiness zone, June requires specific maintenance tasks to keep the garden healthy and productive through the summer peak.

1. Mulching and moisture conservation

• Apply mulch: Lay down a two to three inch layer of organic mulch (such as clean straw, shredded leaves, or compost) over all exposed soil. This reduces evaporation, stabilizes soil temperatures, and prevents weed seeds from germinating.
• Drip irrigation: Install drip irrigation or soaker hoses beneath the mulch to deliver water directly to the root zones, minimizing water waste. For container gardeners, managing water is especially critical; consult our advice on container gardens summer survival to prevent rapid drying.

2. Pest and disease monitoring

• Daily inspections: Walk the garden daily to check the undersides of leaves for pest eggs, such as those of the squash bug or tomato hornworm. Hand-pick pests and drop them into soapy water.
• Fungal prevention: Water early in the morning to allow foliage to dry before nightfall, reducing the spread of fungal diseases like powdery mildew and blight.

3. Pruning and staking support

• Trellising: Secure rapid summer growth of tomatoes, pole beans, and cucumbers to sturdy trellises or stakes.
• Pruning indeterminate tomatoes: Remove suckers (the small shoots that grow in the crotch between the main stem and branches) to improve airflow and direct the plant's energy toward fruit production.